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<title>Documentation: Changes: 2.3.0</title>
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<div id="version" align=right><b>petsc-3.4.2 2013-07-02</b></div>
<h1>Documentation: Changes: 2.3.0</h1>
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<h2><a name="CHANGES">CHANGES in PETSc 2.3.0</a></h2>
</div>
<h4>General:</h4>
<ul>
<li>
The equivalent of building BOPT=g, BOPT=O versions for
PETSC_ARCH=linux-gnu is now: config/configure.py [options]
-PETSC_ARCH=linux-gnu config/configure.py [options]
--with-debugging=0 -PETSC_ARCH=linux-gnu-opt
</li>
<li>
Python bindings added to PETSc. To use, configure with:
--with-python=1 ---with-shared=1 To build, use: 'make python' after
building PETSc libraries. Example in
src/snes/examples/tutorials/ex1.py
</li>
<li>Options database keys -trmalloc[_xxx] are changed to -malloc[_xxx]</li>
<li>-get_resident_set_size and -trinfo are changed to -memory_info</li>
<li>PetscTrValid() -> PetscMallocValidate(), PetscTrDebug() -> PetscMallocDebug()</li>
<li>-trdebug -> -malloc_debug</li>
<li>
PetscGetResidentSetSize() -> PetscMemoryGetCurrentUsage(), added
PetscMemoryGetMaximumUsage() and PetscMemorySetGetMaximumUsage()
</li>
<li>PetscTrSpace() -> PetscMallocGetCurrentUsage() and PetscMallocGetMaximumUsage()</li>
<li>added PetscOptionsEnum() and PetscOptionsGetEnum()</li>
<li>
added PetscBag object for managing user created structs including
initializing them and serializing them.
</li>
<li>
removed PetscSetCommWorld(). Now you can directly assign to
PETSC_COMM_WORLD before PetscInitialize().
</li>
</ul>
<h4>Vec:</h4>
<ul>
<li>Faster generation of VecScatter for many processes when indices are mostly sorted</li>
<li>
Changed BLAS-type interfaces to PETSc-style:
<ul>
<li>VecShift</li>
<li>VecScale</li>
<li>VecSet</li>
<li>VecSetRandom</li>
<li>VecAXPY</li>
<li>VecAXPBY</li>
<li>VecAYPX</li>
<li>VecMAXPY</li>
<li>VecWAXPY</li>
</ul>
</li>
<li>
Changed order of arguments in pointwise routines:
<ul>
<li>VecPointwiseMult</li>
<li>VecPointwiseMax</li>
<li>VecPointwiseMin</li>
<li>VecPointwiseMaxAbs</li>
<li>VecPointwiseDivide</li>
</ul>
</li>
</ul>
<h4>Mat:</h4>
<ul>
<li>Changed MatConvert to require a reuse parameter to denote inplace converstion</li>
<li>Added Cholesky and ICC support to SeqBAIJ</li>
<li>Added the argument MatFactorInfo to MatLUFactorNumeric() and MatCholeskyFactorNumeric()</li>
<li>Faster MatSetValues()</li>
<li>Faster parallel-matrix vector products</li>
<li>Changed MatCreate() to take only a communicator</li>
<li>Added MatSetSize() to specify matrix sizes</li>
<li>
Changed BLAS-type interfaces to PETSc-style:
<ul>
<li>MatAXPY</li>
<li>MatAYPX</li>
<li>MatScale</li>
<li>MatShift</li>
</ul>
</li>
<li>Change MatZeroRows() and MatZeroRowsLocal() to use arrays, and added IS versions</li>
</ul>
<h4>PC:</h4>
<ul>
<li>Added PCILUReorderForNonzeroDiagonal() and PCLUReorderForNonzeroDiagonal()</li>
<li>
Replace PCLUSetDamping(), PCILUSetDamping(), PCCholeskySetDamping()
and PCICCSetDamping() by PCFactorSetShiftNonzero(). Change the option
database keys -pc_lu_damping, -pc_ilu_damping, -pc_cholesky_damping
and -pc_icc_damping to -pc_factor_shift_nonzero
</li>
<li>
Replace PCLUSetShift(), PCILUSetShift(), PCCholeskySetShift() and
PCICCSetShift() by PCFactorSetShiftPd(). Change the option database
keys -pc_lu_shift, -pc_ilu_shift, -pc_cholesky_shift and
-pc_icc_shift to -pc_factor_shfit_positive_definite
</li>
<li>
PCMG: will automatically using the outer pmat operator to define the
finest level operator if not user supplied
</li>
<li>
PCMG: added MGUseGalerkin(), -pc_mg_galerkin option to have coarser
grid matrices computed from the finest grid matrix
</li>
<li>
PCMG: now does referencing counting on set vectors and
restriction/interpolation matrices so user need not keep reference to
free later
</li>
<li>
PCMG: if user does not provide restriction the interpolation is used
and vis versa
</li>
<li>
PCMG: if user does not provide Vecs for each level, will
automatically provide them
</li>
<li> All routines that began with MG now begin with PCMG</li>
<li>
Added PCShellSet/GetContext() and removed the context passed into
PCSetApply() and PCSetApplyRichardson()
</li>
</ul>
<h4>KSP:</h4>
<ul>
<li>
-ksp_cg_Hermitian and -ksp_cg_symmetric have been changed to
-ksp_cg_type Hermitian or symmetric
</li>
<li>
Changed options for -ksp_gmres_cgs_refinement_type from never or
ifneeded or always to REFINE_NEVER or REFINE_IFNEEDED or
REFINE_ALWAYS
</li>
</ul>
<h4>config/configure.py:</h4>
<h4>SNES:</h4>
<ul>
<li>
Changed the name and calling sequence for SNESSetLineSearchCheck() to
SNESLineSearchSetPostCheck() and added
a SNESLineSearchSetPreCheck()
</li>
<li>
Changed the names of all SNESxxxxLineSearchyyyy() to
SNESLineSearchxxxxyyyy() per PETSc naming standard.
</li>
<li>Now allow a constant vector to be specified in SNESSolve()</li>
<li>Removed the Vec argument from SNESSetUp()</li>
<li>
Corrected the order of function and context arguments in:
<ul>
<li>SNESGetFunction()</li>
<li>SNESGetJacobian()</li>
</ul>
</li>
</ul>
<h4>TS:</h4>
<h4>DA:</h4>
<ul>
<li>
Added DAVecGet/RestoreArrayDOF() allowing indexing in the dimension
of degrees of freedom at each point on the lattice.
</li>
<li>Faster DAGlobalToLocal() etc for dof > 1.</li>
</ul>
<h4>DMMG:</h4>
<ul>
<li>Consolidated DMMG functionality into the new header file "petscdmmg.h".</li>
</ul>
<h4>SYS:</h4>
<ul>
<li>
PetscSetCommWorld() removed. [one can directly do PETSC_COMM_WORLD
= comm - before PetscInitialize()]
</li>
</ul>
<h4>Fortran:</h4>
<h4>ExternalPackages:</h4>
<ul>
<li>ML support added.</li>
</ul>
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